@misc{indiciae7bbf19c5cf93,
  title = {Aggradation and degradation of alluvial sand deposits, 1965 to 1986, Colorado River, Grand Canyon National Park, Arizona},
  author = {John C. Schmidt and Julia B. Graf},
  year = {1990},
  doi = {10.3133/pp1493},
  url = {https://pubs.usgs.gov/publication/pp1493},
  note = {Source identifier: pp1493}
}